<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script>
        // 按位与 AND
        /**
         *  25= 0000 0000 0000 0000 0000 0000 0001 1001
         *  3=  0000 0000 0000 0000 0000 0000 0000 0011
         *  -------------------------------------------
         *  AND = 0000 0000 0000 0000 0000 0000 0000 0001
         *
         * @type {number}
         */
        let num1 = 25 & 3;//1
        console.log("num1: " + num1);
    </script>
</head>
<body>

</body>
</html>